Ventilator



E. B. TONNSEN.

VEN'HLAIOR.

APPLICATION HLED APR. 19, 1919.

' 1,332,239, Patented Mar. 2, 1920.

ELIBERT B. TONNSEN, OF MILWAUKEE, WISCONSIN.

VENTILATOR.

Specification of Letters Patent.

Patented Mar. 2, 1920.

Application filed April 19, 1919. Serial No. 291,334.

To all whom it may concern:

Be it known that I, ELIBERT B. ToNNsEN, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Ventilators, of

which the following is a description, reference being had to the accompanying drawings, which are a part of this speeification.

This invention relates to ventilators or cowls which are more particularly designed for automatically ventilating the interior of a building or other space, and which are provided with means whereby the ventilator is automatically shifted into a position in which the wind will operate upon the same for effectively withdrawing the air from the building.

It is the object of this invention to provide a ventilator of this character so constructed that rain snow or any foreign matter will be prevented from passing therethrough and falling into the air vent, and also in which a strong suction effect is produced at the mouth of the air shaft.

It is a further object of this invention to provide a ventilator or cowl of the character described which will be of simple and cflieient construction.

lVith the above and other objects in view which will appear as the description proceeds, my invention resides in the novel construction, combination and arrangement of parts, substantially as hereinafter described, and more particularly defined by the appended claims, it being understood that such changes in the precise embodiment of the hereindisclosed invention may 'be made as come within the scope of the claims.

In the accompanying drawing I have illustrated one complete example of the physical embodiment of my invention constructed according to the best mode I have so far devised for the practical application of the principles thereof, in which:

Figure 1 is a sectional view through a ventilator embodying my invention, said view beino taken on the line 11 of Fig. 2;

Fig. 2 1s a sectional view taken through the line 2-2 of Fig. 1;

Fig. 3 is a view of the underside of the cowl proper, the cowl being removed from the air shaft;

Fig. 4 is a top plan view of the air shaft, the ventilator cowl being removed;

Fig. -5 is a sectional view taken through Fig. 1 on the line Referring now more particularly to the drawing, A designates the ventilator cowl proper which is rotatively supported above an air shaft B. The cowl A is in the form of a substantially horizontal hood, U-shaped in cross section and open at both ends, the open portion of the hood being on the under side thereof and adapted tocommunicate with the air shaft B. The hood is rotatively mounted upon a vertical shaft 6 mounted in suitable bearings 7 and 8, said shaft being centrally disposed in a pair of bracket members or braces 9 disposed in the air shaft at right angles to each other, the accidentaldislodgment of the hood A being prevented by suitable cotter pins or other fastenings 8 engaged with the shaft just above bearing 8. The bearing 8 is in the form of a transverse rod having its ends struck upwardly and secured to the side walls of the hood as at 10 to provide a transverse brace therefor.

A plate 11 is secured in the hood A and is curved upwardly and inwardly from the rear open end thereof, and terminates at a point beyond the center of the hood, and a second plate 12 is inclined inwardly and downwardly from a point inwardly of said open end of the hood and has its inner end near the center of the hood and spaced from the plate 11 forming with the plate 11 a restricted opening. This construction prevents the passage of rain or snow through the ventilator hood or cowl, as will be readily apparent. The lower end of the plate 11 is directed inwardly and is cut away as at 11 to receive the upper end of air shaft B. A pair of spaced upwardly and inwardly inclined plates 13 are secured in the other end of the hood and the termination of the lowermost plate 13 is positioned beneath the inner end of plate 11, and the termination of the upper plate 13 is positioned above plate 11, said plates with plate 11 forming a substantially continuous passage through the hood for currents of air entering through the restricted opening formed by plates 11 and 12. The plates 13 also serve to prevent rain or the like from entering into the hood, and also serve to direct currents of air downwardly and outwardly, increasing the suction or vacuum at the mouth of the air shaft B, the plate 11 and the lowermost plate 13 forming a suetion chamber 1% at the mouth of the air shaft.

A vertical V-shaped reflector 15 is provided centrally in the restricted opening formed by plates 11 and 12, and serves to protect shaft 6 and its bearing 7 from the elements, and further diverges the currents of air passing through the restricted opening and directs them laterally against the side walls of the hood to increase the suction therein. The ventilator hood 17 is provided centrally on its top with a vane 16 of conventional constructionwhich is so constructed as to present the open end of the hood having plate 11 therein to the wind, and the hood also has its lower end struck inwardly to provide the flanges 17 which prevent the entrance of air between the ends of the hood and the air shaft to break the suction at the mouth of the shaft.

From the foregoing description taken in connection with the accompanying drawing it will be obvious that l: h ave provided a ventilator which will prevent snow, rain or the like from heating in and entering the air shaft, which will provide increased suction at the mouth of the air shaft, and which will be efficient in operation.

What I claim as my invention is:

1. A ventilator comprising a substantially horizontal hood open at both ends and provided on its underside with an, opening adapted to communicate with an air shaft, a vertical shaft for rotatahly supporting the hood, said shaft having its upper end engaged with the top wall of the hood, and a vertical deflector in the hood between its inlet end and the shaft whereby air currents passing through the hood are directed toward the side walls of the hood to increase the suction therein and the shaft is protected from the elements.

2. A ventilator comprising a substantially horizontal hood open at both ends and provided on its underside with an opening adapted to communicate with an air shaft, a plate in the hood and curved upwardly and inwardly from one open end thereof to provide an intermediate restricted opening in the hood, a supporting shaft having its upper end disposed within the hood and rotatably supporting the same, said shaft having its upper portion adjacent said restricted opening, and a deflector in said restricted opening whereby to protect the shaft from the elements and to deflect air currents enterin g the hood to the side.

A ventilator comprising a rotatable, substantially horizontal hood open at both ends and provided on its underside with an opening adapted to communicate with an air shaft. a plate in the hood and curved upwardlyand inwardly from one open end thereof, a second plate inwardly and downwardly inclined to provide with the other plate an intermediate restricted opening in the hood, a deflector in the restricted opening thus formed, and means for directing the air currents emitting from said restricted opening whereby to create a suction at the mouth of said air-shaft.

4-. ventilator comprising a rotatable, substantially horizontal hood open at both ends and provided at its underside with an opening adapted to communicate with an air shaft, a plate in the hood and curved upwardly and inwardly from one open end thereof, a V-shaped deflector located intermediate the side walls of the hood adjacent the termination of said upwardly and inwardly curved plate whereby to direct air currents toward the side walls of the hood, and means for directing the air currents emitting from the opening formed by said plate whereby to create a suction at the mouth of the air shaft.

A ventilator comprising a rotatable, substantially horizontal hood open at both ends and provided at its underside with an opening adapted to communicate with an air shaft, a plate in the hood and curved upwardly and inwardly from one open end thereof, a second plate inwardly and down wardly inclined to provide with said other plate an intermediate restricted opening in the hood having a flaring inlet mouth, and deflectors disposed in the other open end of of the hood for directing the air currents emitting from said restricted opening downwardly whereby to create a suction at the mouth of said air shafts. v

In testimony whereof I afiix my signature.

ELIBERT B. TONNSEN. 

